diff --git a/src/core/Engine.js b/src/core/Engine.js
index 7e1567b..a8e5119 100644
--- a/src/core/Engine.js
+++ b/src/core/Engine.js
@@ -111,6 +111,15 @@ var Engine = {};
                 timestamp: timestamp
             };
 
+            /**
+            * Fired at the start of a tick, before any updates to the engine or timing
+            *
+            * @event beforeTick
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             Events.trigger(engine, 'beforeTick', event);
 
             delta = (timestamp - timing.timestamp) || _delta;
@@ -140,6 +149,24 @@ var Engine = {};
                 frameCounter = 0;
             }
 
+            /**
+            * Fired after engine timing updated, but just before engine state updated
+            *
+            * @event tick
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
+            /**
+            * Fired just before an update
+            *
+            * @event beforeUpdate
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             Events.trigger(engine, 'tick beforeUpdate', event);
 
             // update
@@ -147,30 +174,96 @@ var Engine = {};
 
             var pairs = engine.pairs;
 
+            /**
+            * Fired after engine update, provides a list of all pairs that have started to collide in the current tick (if any)
+            *
+            * @event collisionStart
+            * @param {} event An event object
+            * @param {} event.pairs List of affected pairs
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             if (pairs.collisionStart.length > 0) {
                 Events.trigger(engine, 'collisionStart', {
                     pairs: pairs.collisionStart
                 });
             }
 
+            /**
+            * Fired after engine update, provides a list of all pairs that are colliding in the current tick (if any)
+            *
+            * @event collisionActive
+            * @param {} event An event object
+            * @param {} event.pairs List of affected pairs
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             if (pairs.collisionActive.length > 0) {
                 Events.trigger(engine, 'collisionActive', {
                     pairs: pairs.collisionActive
                 });
             }
 
+            /**
+            * Fired after engine update, provides a list of all pairs that have ended collision in the current tick (if any)
+            *
+            * @event collisionEnd
+            * @param {} event An event object
+            * @param {} event.pairs List of affected pairs
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             if (pairs.collisionEnd.length > 0) {
                 Events.trigger(engine, 'collisionEnd', {
                     pairs: pairs.collisionEnd
                 });
             }
 
+            /**
+            * Fired after engine update and all collision events
+            *
+            * @event afterUpdate
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
+            /**
+            * Fired just before rendering
+            *
+            * @event beforeRender
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             Events.trigger(engine, 'afterUpdate beforeRender', event);
 
             // render
             if (engine.render.options.enabled)
                 engine.render.controller.world(engine);
 
+            /**
+            * Fired after rendering
+            *
+            * @event afterRender
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
+            /**
+            * Fired after engine update and after rendering
+            *
+            * @event afterTick
+            * @param {} event An event object
+            * @param {DOMHighResTimeStamp} event.timestamp The timestamp of the current tick
+            * @param {} event.source The source object of the event
+            * @param {} event.name The name of the event
+            */
             Events.trigger(engine, 'afterTick afterRender', event);
         })();
     };